Ever since the beta for Littlebigplanet hit, we've seen numerous level designs, some good,…
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Oh Internet, you spoil us. PSN user 'Cristel' has gone and implemented a basic Tic Tac Toe engine, armed only with the LBP level creator, a lot of free time and a catering sized carton of WIN.

Unless we are very much mistaken that counts as actual artificial intelligence - albeit of a simple variety. Hell, in a global thermonuclear war situation this mod could save the world, which translates as some serious modding chops.